Shiva Purana
अथ तद्धर्मदृढतां प्रतीक्षन्परमेश्वरः ॥ लीलां चकार तत्रैव शिवया सह शङ्करः ॥ ८॥
Then, in order to test his steadfastness and piety, lord Śiva carried out his sports there itself along with Śivā.
english translation
atha taddharmadRDhatAM pratIkSanparamezvaraH ॥ lIlAM cakAra tatraiva zivayA saha zaGkaraH ॥ 8॥
hk transliteration by Sanscript